[PATCH 12/11] s390x: Add Add glibc-hwcaps support
Florian Weimer
fweimer@redhat.com
Thu Nov 26 18:54:36 GMT 2020
Subdirectories z13, z14, z15 can be selected, mostly based on the
level of support for vector instructions.
Compared to the earlier version, this adds tests, slightly more
elaborate AT_HWCAP tests, and _dl_hwcaps_subdirs_build_bitmask is used.
I'm open to using different selection logic. I couldn't quite figure
out what GCC-generated code actually requires when using, say,
-march=z14.
The tests pass on a z15 and a zEC12 system, both with z/VM.
The patch is also available on the fw/glibc-hwcaps branch. The
elf/tst-glibc-hwcaps-cache.script patch won't apply against the posted
series.
Thanks,
Florian
---
elf/Makefile | 2 +-
elf/tst-glibc-hwcaps-cache.script | 10 ++++
sysdeps/s390/s390-64/Makefile | 39 ++++++++++++++++
sysdeps/s390/s390-64/dl-hwcaps-subdirs.c | 53 ++++++++++++++++++++++
sysdeps/s390/s390-64/tst-glibc-hwcaps.c | 78 ++++++++++++++++++++++++++++++++
5 files changed, 181 insertions(+), 1 deletion(-)
diff --git a/elf/Makefile b/elf/Makefile
index 37d3af593c..2b8458a18f 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -1828,7 +1828,7 @@ $(objpfx)argv0test.out: tst-rtld-argv0.sh $(objpfx)ld.so \
# Most likely search subdirectories, for each supported architecture.
# Used to obtain test coverage wide test coverage.
-glibc-hwcaps-first-subdirs-for-tests = power9 x86-64-v2
+glibc-hwcaps-first-subdirs-for-tests = power9 x86-64-v2 z13
# The test modules are parameterized by preprocessor macros.
LDFLAGS-libmarkermod1-1.so += -Wl,-soname,libmarkermod1.so
diff --git a/elf/tst-glibc-hwcaps-cache.script b/elf/tst-glibc-hwcaps-cache.script
index 6a4675f9bd..19b06d0adc 100644
--- a/elf/tst-glibc-hwcaps-cache.script
+++ b/elf/tst-glibc-hwcaps-cache.script
@@ -11,6 +11,16 @@ mkdirp 0770 $L/glibc-hwcaps/power10
cp $B/elf/libmarkermod3-2.so $L/glibc-hwcaps/power9/libmarkermod3.so
cp $B/elf/libmarkermod3-3.so $L/glibc-hwcaps/power10/libmarkermod3.so
+mkdirp 0770 $L/glibc-hwcaps/z13
+cp $B/elf/libmarkermod2-2.so $L/glibc-hwcaps/z13/libmarkermod2.so
+mkdirp 0770 $L/glibc-hwcaps/z14
+cp $B/elf/libmarkermod3-2.so $L/glibc-hwcaps/z14/libmarkermod3.so
+cp $B/elf/libmarkermod3-3.so $L/glibc-hwcaps/z14/libmarkermod3.so
+mkdirp 0770 $L/glibc-hwcaps/z15
+cp $B/elf/libmarkermod4-2.so $L/glibc-hwcaps/z15/libmarkermod4.so
+cp $B/elf/libmarkermod4-3.so $L/glibc-hwcaps/z15/libmarkermod4.so
+cp $B/elf/libmarkermod4-4.so $L/glibc-hwcaps/z15/libmarkermod4.so
+
mkdirp 0770 $L/glibc-hwcaps/x86-64-v2
cp $B/elf/libmarkermod2-2.so $L/glibc-hwcaps/x86-64-v2/libmarkermod2.so
mkdirp 0770 $L/glibc-hwcaps/x86-64-v3
diff --git a/sysdeps/s390/s390-64/Makefile b/sysdeps/s390/s390-64/Makefile
index b4d793bb3d..e5da26871c 100644
--- a/sysdeps/s390/s390-64/Makefile
+++ b/sysdeps/s390/s390-64/Makefile
@@ -6,4 +6,43 @@ ifeq ($(subdir),elf)
CFLAGS-rtld.c += -Wno-uninitialized -Wno-unused
CFLAGS-dl-load.c += -Wno-unused
CFLAGS-dl-reloc.c += -Wno-unused
+
+$(objpfx)tst-glibc-hwcaps: $(objpfx)libmarkermod2-1.so \
+ $(objpfx)libmarkermod3-1.so $(objpfx)libmarkermod4-1.so
+$(objpfx)tst-glibc-hwcaps.out: \
+ $(objpfx)libmarkermod2.so \
+ $(objpfx)glibc-hwcaps/z13/libmarkermod2.so \
+ $(objpfx)libmarkermod3.so \
+ $(objpfx)glibc-hwcaps/z13/libmarkermod3.so \
+ $(objpfx)glibc-hwcaps/z14/libmarkermod3.so \
+ $(objpfx)libmarkermod4.so \
+ $(objpfx)glibc-hwcaps/z13/libmarkermod4.so \
+ $(objpfx)glibc-hwcaps/z14/libmarkermod4.so \
+ $(objpfx)glibc-hwcaps/z15/libmarkermod4.so \
+
+$(objpfx)glibc-hwcaps/z13/libmarkermod2.so: $(objpfx)libmarkermod2-2.so
+ $(make-target-directory)
+ cp $< $@
+$(objpfx)glibc-hwcaps/z13/libmarkermod3.so: $(objpfx)libmarkermod3-2.so
+ $(make-target-directory)
+ cp $< $@
+$(objpfx)glibc-hwcaps/z14/libmarkermod3.so: $(objpfx)libmarkermod3-3.so
+ $(make-target-directory)
+ cp $< $@
+$(objpfx)glibc-hwcaps/z13/libmarkermod4.so: $(objpfx)libmarkermod4-2.so
+ $(make-target-directory)
+ cp $< $@
+$(objpfx)glibc-hwcaps/z14/libmarkermod4.so: $(objpfx)libmarkermod4-3.so
+ $(make-target-directory)
+ cp $< $@
+$(objpfx)glibc-hwcaps/z15/libmarkermod4.so: $(objpfx)libmarkermod4-4.so
+ $(make-target-directory)
+ cp $< $@
+
+ifeq (no,$(build-hardcoded-path-in-tests))
+# This is an ld.so.cache test, and RPATH/RUNPATH in the executable
+# interferes with its test objectives.
+tests-container += tst-glibc-hwcaps-cache
endif
+
+endif # $(subdir) == elf
diff --git a/sysdeps/s390/s390-64/dl-hwcaps-subdirs.c b/sysdeps/s390/s390-64/dl-hwcaps-subdirs.c
new file mode 100644
index 0000000000..fa8d2ce1f1
--- /dev/null
+++ b/sysdeps/s390/s390-64/dl-hwcaps-subdirs.c
@@ -0,0 +1,53 @@
+/* Architecture-specific glibc-hwcaps subdirectories. s390x version.
+ Copyright (C) 2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <dl-hwcaps.h>
+#include <ldsodefs.h>
+
+const char _dl_hwcaps_subdirs[] = "z15:z14:z13";
+enum { subdirs_count = 3 }; /* Number of components in _dl_hwcaps_subdirs. */
+
+uint32_t
+_dl_hwcaps_subdirs_active (void)
+{
+ int active = 0;
+
+ /* Test in reverse preference order. */
+
+ /* z13. */
+ if (!(GLRO (dl_hwcap) & HWCAP_S390_VX))
+ return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
+ ++active;
+
+ /* z14. */
+ if (!((GLRO (dl_hwcap) & HWCAP_S390_VXD)
+ && (GLRO (dl_hwcap) & HWCAP_S390_VXE)
+ && (GLRO (dl_hwcap) & HWCAP_S390_GS)))
+ return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
+ ++active;
+
+ /* z15. */
+ if (!((GLRO (dl_hwcap) & HWCAP_S390_VXRS_EXT2)
+ && (GLRO (dl_hwcap) & HWCAP_S390_VXRS_PDE)
+ && (GLRO (dl_hwcap) & HWCAP_S390_SORT)
+ && (GLRO (dl_hwcap) & HWCAP_S390_DFLT)))
+ return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
+ ++active;
+
+ return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
+}
diff --git a/sysdeps/s390/s390-64/tst-glibc-hwcaps.c b/sysdeps/s390/s390-64/tst-glibc-hwcaps.c
new file mode 100644
index 0000000000..39f56d0c81
--- /dev/null
+++ b/sysdeps/s390/s390-64/tst-glibc-hwcaps.c
@@ -0,0 +1,78 @@
+/* glibc-hwcaps subdirectory test. s390x version.
+ Copyright (C) 2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <stdio.h>
+#include <string.h>
+#include <support/check.h>
+#include <sys/auxv.h>
+#include <sys/param.h>
+
+extern int marker2 (void);
+extern int marker3 (void);
+extern int marker4 (void);
+
+/* Return the POWER level, 8 for the baseline. */
+static int
+compute_level (void)
+{
+ const char *platform = (const char *) getauxval (AT_PLATFORM);
+
+ int result;
+ if (sscanf (platform, "arch%d", &result) == 1)
+ return result;
+
+ /* The arch* versions refer to the edition of the Principles of
+ Operation, and they are off by two when compared with the recent
+ product names. (The code below should not be considered an
+ accurate mapping to Principles of Operation editions for earlier
+ AT_PLATFORM strings). */
+ if (strcmp (platform, "z900") == 0)
+ return 5;
+ if (strcmp (platform, "z990") == 0)
+ return 6;
+ if (strcmp (platform, "z9-109") == 0)
+ return 7;
+ if (strcmp (platform, "z10") == 0)
+ return 8;
+ if (strcmp (platform, "z196") == 0)
+ return 9;
+ if (strcmp (platform, "zEC12") == 0)
+ return 10;
+ if (strcmp (platform, "z13") == 0)
+ return 11;
+ if (strcmp (platform, "z14") == 0)
+ return 12;
+ if (strcmp (platform, "z15") == 0)
+ return 13;
+ printf ("warning: unrecognized AT_PLATFORM value: %s\n", platform);
+ /* Assume that the new platform supports z15. */
+ return 13;
+}
+
+static int
+do_test (void)
+{
+ int level = compute_level ();
+ printf ("info: detected architecture level: arch%d\n", level);
+ TEST_COMPARE (marker2 (), MIN (level - 9, 2));
+ TEST_COMPARE (marker3 (), MIN (level - 9, 3));
+ TEST_COMPARE (marker4 (), MIN (level - 9, 4));
+ return 0;
+}
+
+#include <support/test-driver.c>
--
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